List every Provider in this credential's Domain
No pagination envelope, no page/limit/search params — Providers have no discovery concept (control-plane only, AD-06 §21). Returns an empty array for a ProjectRuntimeContext credential (external user asserted) — Providers can never be ExternalUser-owned, so nothing in this list would be individually fetchable by that same credential anyway; only a ProjectMachineContext credential sees the real list.
Authorizations
Developer Platform Project credential, minted via POST /api/v1/projects/{projectId}/credentials. Send as Authorization: Bearer <keyId>.<secret>. Optionally pair with the x-persona-external-user-id header to act on behalf of one of the Project's own external users. This credential is a server-side secret — see the Integration Guide.
Response
Array of Providers in this Domain